Collapsible core for tire-casings.



Patent-ed A11 JEUEHZZLP WM W. F. BRUNSWICK.

COLLAPSIBLE CORE FOR TIRE CASINGS.

APPLICATION FILED OCT. I8. 1915. 1,196,513.,

W. F. BRUNSWICK.

COLLAPSIBLE com: FOR TIRE CASINGS.

APPLICATION FILED OCT. I8. I9I5.

Patented Aug. 29, 1916..

2 SHEETS-SHEET 2.

WILLIAM F. BRUNSWICK, OF AKRON, OHIO.

COLLAPSIBLE CORE FOR, 'lIRE-CASINGS.

Specification of Letters Patent.

Patented Aug. 29, 1916.

Application filed October 18, 1915. Serial No. 56,381.

To all whom it may concern:

Be it known that I, WILLIAM F. BRUNS- wion, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Collapsible Cores for Tire-Casings, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

In the manufacture of tire. casings it is customary to build the carcass and other parts of the tie on a collapsible core, the core being separable in such manner that it may be removed inwardly from the casing. The different sections of such collapsible cores have usually been held together by rings bolted to the sides of inwardly proj ecting arcual ribs on the sections, the bolts and rings being removed when the core is to be collapsed. Such method requires considerable time in separating and thereafter reassembling the core, and inaccuracies in the presentation of one section to another are liable to result.

The object of my invention is toprovide such means for holding the sections together as will effect an accurate presentation of the sections to each other, and a secure retention of them when the-core is in use, while allowing the separation and reassembling to be effected with great rapidity, whenever desired.

To the above end I have provided a set of stirrups which are adapted to lap over the inwardly projecting portions of adjacent core sections, and I have combined with these stirrups certain wedges which draw the stirrups and sections towardeach other and also draw the sections toward each other, thus giving a combined radial and circumferential clamping which effectively holds the parts in position.

My invention is hereinafter more fully explained in connection with the drawings, which show the preferred form thereof, and the essential characteristics are set out in the claims.

In the drawings, Figure 1 is a side elevation of a collapsible core embodying my in vention; Fig. 2 is a fragmentary section in central plane of the core (2., parallel to Fig. 1), at the junction of two of the sections, as indicated by the line 22 of Fig.-

3; Fig. 3 is an arcual section on the line 33 of Fig. 1, looking outwardly; Fig. 1 is a radial section on the line H of Fig. 1; Fig. 5 is a section of some intermediate point, as indicated by the line 5-5 of Fig. 1; Fig. 6 is a view similar to Fig. 5, illus trating the position of the tire casing on the core.

In the particular embodiment shown in Fig. 1, the coreis made of four sections, designated 10 to 13 respectively. Along the inner edge of each section is a parallel sided arcual portion designated 15. The section 12 has its ends in radial planes, the section 10 in diverging planes, and the sections 11 and 13 their ends in a plane corresponding to the adjacent ends of sections 12 and 10. When the four parts are assembled, a complete annulus is provided, which is readily separable by drawing inwardly the section 10. WVhen assembled, the arcual portions 15 make a complete ring, the inner edge of which has a groove 16 in which may be seated the ends of an expanding central spider which may support the core. The construction so far described is of the usual form in collapsible cores for tire casings.

2O designates metal stirrups which are arcual in one direction and substantially U-shaped or three sided in the other. That is to say, each stirrup has an arcual base portion 21 the outer surface of which is curved on the same radius as the inner surface of the ring 15. This base has a width equal to or slightly greater-than the thick ness ofthe portion 15 of the core. Extending from the edges of the base are two wings 22 and 23 which thus lie on opposite sides of the inward ribs 15 of the sections.

There are as many of the stirrups described as there are sections and each stirrup is adapted to overlap the junction of two sections. The stirrup is held in this position by two wedges-30 driven through openingsin the stirrup and corresponding openings in the ribs 15 of the sections. The form of these wedges may be varied, but a preferable characteristic thereof is that they are adapted to produce a wedging action both radially and circumferentially. In the form shown the wedges are rectangular in cross section, the longer dimension of the wedge heingin the circumferential direction and so formed that one or both of the narrow edges of the wedge are inclined, as shown at 31 in Fig. 3, and one or both of the wide faces inclined, as shown at 32 in Fig. 4. The openings 17 in the ribs, which the wedges occupy, are offset both circumferentially and radially in theoutward direction from the registering openings 24: in the stirrup, wherefore, when the wedges are driven into place they draw the core sections circumferentially together and radially inward, drawing the stirrup radially outward, thus making a very tight connection between all the parts.

FigsJB and 4 show the wedges inclined only on one edge and one face, the inclined edges being the inner edges and the inclined faces being those toward the center of the core, and the corresponding walls of the openings 17 (namely the inner walls and those nearest the center), being correspondingly inclined. If desired, however, the inclines may be formed on the stirrups instead of the core sections, or inclines may be made at both places, or the wedges instead of being rectangular may be in the form of taper pins, none of such changes altering the action described.

It will be readily understood that my core is assembled by putting the sections in proper place, placing the stirrups over the ribs at the junction and driving the wedges in place. IVhen the wedges are driven home it will be seen that the base of the stirrup makes a brace across the inner edge of the ribs 15 of the adjacent sections, thus insuring the outer edges of these sections accurately meeting, which was not always the case where the sections were held by rings bolted to the sides of the ribs 15. My fas- .tening device occupies little room, and in no way interferes with the tire casing, as indicated at A in Fig. 6.

Vhen it is desired to collapse the core it is simply necessary to drive out the wedges and remove the stirrups. A hammer blow on the small end of the wedge will readily accomplish this, or if desired, the whole core may be dropped at once on a suitable abutment which may knock out the various wedges simultaneously. As there is no grease used about these cores there is nothing to cause the wedges to slip and accordingly the wedge may have'a suflicient taper to allow it to be readily removed and at the same time effectively retain its position. The amount of draw given by the wedges allows sufficient clearance at the openings to enable the stirrups and wedges to be rapidly put in place.

It may be noted that my stirrups and wedges may be applied to existing cores simply by discarding the usual rings and bolts and forming proper holes through the section ribs 15, orproperly positioning holes in the stirrups to coact with the existing holes in the ribs. The stirrups may conveniently be made by turning a complete channel-shaped ring to proper size and thereafter sawing it into sections.

Having thus described my invention, what I claim is:

1. In a. collapsible (ore for tire casing; the combination of separable sections adapted to form an annulus, a set of individual devices located at the respective junctions ol the sections, each device extending onto both sides of the inner portions of the sections and extending circumit'erentially across the junction of said sections, and means engaging the sections and devices for drawing the sections together.

2. In a. collapsible core for tire casings, the combination of sections having inwardly projecting ribs, and stirrups extending onto both sides of said ribs and provided with devices for drawing the stirrups into intimate contact with the inner periphery of the ribs and for drawing the core-sections together circumferentially.

3. In a collapsible core, the combination of separable. sections having inwardly projecting ribs, 'a member adapted to overlap both sides of such ribs at their junction, and wedges adapted to pass through such member and the intervening ribs of such adjacent sections.

4. In a collapsible core, the combination of separable sections having inwardly projecting ribs, a stirrup adapted to embrace such ribs and extend circumferentially across their junction on both sides thereof, and wedges adapted to pass through such stirrup and the intervening ribs, and adapted to draw the base of the stirrup against the inner periphery of the ribs.

5. In a collapsible core for tire casings, the combination of separable sections having inwardly extending arcual ribs, stirrups having arcual bases and side wings adapted to overlap the ribs of adjacent sections on both sides thereof, and means engaging the stirrups and the ribs for drawing the sec tions together.

6. In a collapsible former for tire casings, the combination of a set of core sections adapted to form an annulus and having inwardly extending arcual' ribs adapted to constitute a ring, a set of stirrups each consisting of an arcual base and a pair of wings adapted to embrace the ribs of adjacent sections extending across their junction, and wedges adapted to be driven through the wings of said stirrups and through the intervening ribs.

7. The combination with core sections, of stirrups adapted to circumferentially overlap adjacent sections and extend transversely on both sides thereof, and wedges adapted to pass through the stirrups and the intervening sections, said wedges being inclined in two directions to draw the sections together circumferentially and the stirrups radially outward.

8. In a collapsible former for tire casings, the combination of a set of core sections adapted to form an annulus and having inwardly extending arcual ribs adapted to constitute a ring, a set of stirrups each consisting of a base and a pair of wings adapted to embrace the ribs of adjacent sections and extend across their junction, and wedges adapted to be driven through the wings of said stirrups and through the intervening ribs of the sections, the holes occupied by the wedges in the sections registering with the corresponding holes in the stirrups but having their edges out of alinement therewith when the Wedges are driven home.

9. The combination with core sections, of stirrups adapted to circumferentially overlap adjacent sections and extend transversely on both sides thereof, and wedges adapted to pass through both the wings of the stirrups and the intermediate sections, said wedges being approximately rectangular in cross section and having their wide portions lying circumferentially, each wedge having a narrow edge inclined and a wide face inclined.

10. In a collapsible core for tire'casings, the combination of sections adapted to abut to form a complete annulus, each section having on its inner edge an arcual rib which ribs form a complete ring, a set of stirrups having arcual bases, the radius of the outer face of which is substantially equal to the radius of the inner face of the rib and having wings, the distance between which corresponds to the thickness of the ribs, there being registering holes through both wings of the stirrups and through the ribs adjacent to the ends thereof, said holes being out of strict alinement when the sections are in proper position, and wedges inclined in two directions and each adapted to be driven through a hole in one wing, through the registering hole in the rib and through the hole in the opposite wing and in such movement to draw the sections together circumferentially and radially.

11. The combination, with core sections, of stirrups adapted to circumferentially overlap adjacent sections and extend transversely on both sides thereof, and wedges adapted to pass through the stirrups and the intervening sections.

12. In a collapsible former for tire casings, the combination of separable sections adapted to form an annulus, said sections being provided with inwardly projecting arcual ribs adapted to form an annular flange, a set of individual devices located respectively at the junctions of the adjacent ribs, said devices embracing the ribs engaging the inner periphery thereof and extending onto both sides thereof and overlapping the junctions, and means engaging said devices and engaging the ribs adjacent theretofor drawing the sections together.

In testimony whereof, I hereunto affix my signature.

WILLIAM F. BRUNSWICK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patenta. Washington, D. G. 

